From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Bad commutation in dynamos due to improperly removed mica from slots and plans for further investigation.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan151 | |
| Date | 7th March 1924 | |
| EFC1/T.7.3.24. (4) Contd. were undercut. There was usually considerable evidence of mica not having been properly removed from the sides of the slots, and our own experience goes to show that this was a definite cause of bad commutation. This cannot now happen. Our expression "not undercut", then, refers to this earlier condition. A further report will follow shortly which will contain the comparative commutation results on the two coils per slot armatures. There will also be a further report dealing with the EAC type of brush gear on the 20 HP. dynamo. EFC. | ||